CVE-2011-3402KEV · OVERDUE

Microsoft Windows Remote Code Execution Vulnerability

High · published November 4, 2011

Patch now

Confirmed exploited, and the score agrees

CVSS calls it high at 8.8. It is confirmed in active exploitation. It sits in the 99.6th percentile for exploit probability.

360
days past CISA
deadline
CVSS v3.1
8.8
EPSS
78%
Percentile
99.6
In the wild
Confirmed
What it is

🚨 A crafty Word document can unleash chaos by exploiting a sneaky font parsing vulnerability. Attackers can execute arbitrary code on affected Windows systems! ⚡ Think of it like a magician's trick where the audience is entranced by a beautifully designed card, only to discover it's hiding a shocking revelation. In this case, the ‘card’ is crafted font data that tricks the system into running malicious code. If successfully exploited, an attacker could gain control of your system, allowing them to install malware, steal sensitive data, or even manipulate files. This could lead to absolute devastation for individuals and organizations alike.

Put simply

Think of it like a magician's trick where the audience is entranced by a beautifully designed card, only to discover it's hiding a shocking revelation. In this case, the ‘card’ is crafted font data that tricks the system into running malicious code. This vulnerability resides in the TrueType font parsing engine within the win32k.sys file, allowing remote attackers to execute arbitrary code via specially crafted font data embedded in documents or web pages.

What to do

If successfully exploited, an attacker could gain control of your system, allowing them to install malware, steal sensitive data, or even manipulate files. This could lead to absolute devastation for individuals and organizations alike. To protect your systems, ensure you update to the latest security patches from Microsoft. Disable or restrict the use of legacy document formats where possible, and consider implementing strong security solutions that can detect and block such exploits. You've got this! Keep your systems updated and stay vigilant 🛡️.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.78138 · 99.6th percentile
Published
2011-11-04T21:00Z
KEV added
2025-10-06 · due 2025-10-27
EPSS history
Timeline
  • 06 OCT 00:00Z
    Added to CISA KEV — remediate by Oct 27
    kev
  • 04 NOV 21:00Z
    Unspecified vulnerability in the TrueType font parsing engine in win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP2 and SP3, Windows Server 2003…
    cvelistv5